Empty animation makes Transform Inspector yellow, model without animation has keyframes
Your still armature has been keyframed. It stays still because all the poses are the same all along the timeline, orange lines between the yellow dots mean that there are no change between all these poses.
In the Transform panel, green value means the armature is animated but is not keyframed at the selected frame, yellow means it is keyframed at the selected frame.
If you zoom in you'll see that the keyframes have been scaled and do not match with the timeline anymore, thus the sometimes green color on the Transform panel, when you're on a frame where there are no keyframe:

If you select and move the keyframes you can easily make them match to the timeline, and you'll see that your Transform panel will be yellow all along the scrub: